Improvement in boiler-tube cleaners



C.v SCHMANIJT.AA

Boiler-Tube Cleaner.

Patented March 3o, 1375.

-INVENoRr -WITNESSE i ITE STA-TES CHARLES SCHMANDT, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN BOILERTUBE CLEANERS.

Specification forming part of Letters Patent No. 161,558, dated March 30, 1875; application filed March 5, 1875.

To all whom it may concern:

Be it known that I, CHARLES SCHMANDT, of the city of Baltimore, State of Maryland, have invented an Improved Device for Cleaning the Inner Surfaces of Tubes, of which the following is a specification; and I do hereby declare that in the same is contained a full, clear, and Vexact description of my said invention, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

My invention relates to a device, hereinaf ter fully described, adapted to be used in the removal of scale or other deposit from the inner surfaces of tubes, and is specially designed for the cleansing of the tubes of boilers of the class usually known as sectional, and in which the water in the boiler comes into contact with the inner surface of the tubes, the outer surface of the same being acted upon by the re.

In the description of my invention which follows, due reference must be had to the accompanying drawing, forming a part of this specification, and in which- Fig. lis a side view of the device, closed or contracted in width to allow of its introduction to the boiler-tube. Fig. 2 is an edge view of the same. Fig. 3 is a side view of the invention, extended as when in operation. Fig. 4 is a sectional View of a part of a tube of a sectional boiler, showing the manner in which the entrance to the same is usually obstructed by bolts, and the position occupied by the several parts of the device when in use. Fig. 5 is a view of the invention modied in the construction of its parts.

Similar letters of reference indicate similar parts in all the figures.

A is a block or head to which are pivoted the arms a, jointed nearly centrally of their length, and connected at their outer extremities by the pin b. The pin b also serves to connect the rod c to the ends of the arms a, and to furnish means by which a conjoined movement ofthe said rod and arms is effected. In Figs. l, 2, 3, and 4 the rod c is shown as jointed, to admit of its occupying the position shown in Fig. 4. B is a pipe screwed into the block A, and of such internal diameter as will admit of the rod c, passing loosely throughits entire length. Cis a spiral spring, adapted to occupy a limited portion of the rod c, between the end of the pipe B and a thumb-nut, d, screwed upon the rod, near to the end thereof. The spiral spring is designed to answer the purpose of a iexible washer, to prevent rigidity of the arms under circumstances hereinafter described. D D

are circular toothed cutters, adapted to rotate upon the pins in the joints of the arms a.

The following is a description of the manner in which my invention is used in the operation of scaling a tube, the entrance to which is obstructed by bolts, as is shown in Fig. 4: The thumb-nut d is first unscrewed from contact with the spiral spring, and the device closed, as shown in Figs. 1 and 3, when it can be easily inserted in the tube. The arms are then extended by means of the thumb-nut d, which is screwed into contact with the spiral spring, the cutters D being thereby forced closely to the scale in the tube. Upon the necessary tension being obtained the device is drawn backward and forward in the tube, the cutters removing a portion of the scale in a longitudinal direction equal to the widtli across the faces of the cutters. The device is then turned and another portion of the scale removed, the operation being continued until the cutters have traversed the entire inner circumference of thed tube.

'Ihe resiliency. of the spiralspring allows the device to adapt itself to any variation in size of the tube, and prevents the placing of an undue strain upon any of its parts.

The device can be constructed with four or more arms and sets of cutters, and with a rigid rod or with joints in the arms and rod, as shown in Fig. 5.

Having thus described my invention, what I claim as new, and desire to secure 'by Letters Patent of the United States, is-

1. rIhe jointed arms c, pivoted to the block A, and provided with the revolvable cutters D, in combination. with the rod c, substantially as described.

2. The combination of the block A, jointed arms a, cutters D, rod c, pipe B, spiral spring C, and thumb-nut d, substantially as and for the purposes specified.

In testimony whereof I hereunto subscribe my name this 24th day of February, A. D. 1875. Y

CHARLES SCHMANDT.

Witnesses:

WM. S. HOWARD, JNO. S. MADDoX. 

